Dental-crown-swaging machine.



PATENTED MAR. 10, 1908.

L. c. GRAHAM. DENTAL GROWN SWAGING MACHINE.

APPLIOATION FILED NOV-6. 1906. I

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E TORQ v A ZTORNEYS' 7 class tile metals.

with exactness the LAURENCE C. GRAHAM, OF WHIGHAM, GEORGIA.

I DENTALORGWN-SWAGING MACHINE.

Specification of Letters Patent.

Patented March 10, 1908.

Application filed November 6, 1906. Serial No. 342,280.

To all whom it may concern:

Be it known that I, LAURENCE C. GRAHAM, a citizen of the ,United States, residing at in the county ofGrady and State of Georgia, have invented a new and useful Eental-Crown-Swaging Machine, of which the fellowing is a specification.

This invention relates to machinesof that employed by dentists in the manufac ture of tooth crowns from gold or other duc- Theprincipal object of the invention is to provide a machine of very simple construction in which interchangeable dies maybe em loyed for the formation of. crowns for bot the posterior and anterior teeth, and in which the crowns may be stamped directly from a sheet of gold or other material, a suflicient area of the sheetbeing cut by the. machine immediately in advance of the swaging operation to form the desired article. 4

'A further object .of the invention is to provide a machine of very simple construction in which the dies may be readily interchanged, the dicsbei ng' provided with identifying marks, such, for Instance, as numerals, in'order that the dentist may determine size and shape of the crowns to be made.

With these and other objects in view, as will more fully hereinafter a pear, the invention consists in certain novel features of construction and arran ement of parts, hereinafter fully described, illustrated in the ac companymg drawings,

and particularly pointed out in the ap pended claims, it being understood that various changes in the form, I

proportions, size and minor details of the structure ma be made without departing from the s irlt or sacrificing any of the advanta es 0 the invention.-

Int e accom anying drawings ::Figure 1 is a sectional elhvation of a crown swaging machine constructed in accordance with the invention. Fig- 2 is a sectional plan view of the same on the line 2-2 of Fi 1. r Fig. 3 is a plan view of the lower or ma e die.

Similar numerals of reference are employed to indicate corresponding arts throughout the several figures of the raw- The machine includes a base 10 from which rises a frame 11 that is provided at the center with a vertically disposed opening for the assage of a plunger 15, and at the top of the rame is'arranged a pair of ears 16 carrying a said rib.

cross pin 17 on which is pivoted a cam lever 18, the cam bein arrangci'l to engage a plate 19 that is secured to the up )erend of the rod 15. This plate is referaby rectangular in form,-.having paral el opposite sides for en gagement with the inner faces of the lugs 16 In order to holdthe plunger rod from rotativemovement. The rod is normally maintained in elevated position by two or more helical compression springs 20, the lower ends. of which are seated in recesses formed in the top of the frame, while the upper ends of said springs fit around guiding pins 21 depending from the lower face of the )late 19,

In the lower portion of t e plunger rod is a recess for the reception of the carrying stem 23 of a female die24, the latter being pro,- vided with diametrically that fit in grooves formed in the. lower face of the plunger rod in order to prevent rotative movement of the die. In order to permit the ready changing of the dies, a spring'held locking pin 28 is employed, said pin having an outer knob or handle 29, and bein normally held in stem engaging osition by a s ring 30. When the pin is u led outward, the stem is released, and t e die may be readily. removed and another placed in its stead. The dies are preferably provided with small anels 32, von which the number or other deslgnating mark may be placed.

' The central portion of the base plate is provided with a boss 33 having a dove tailed recess for the reception of the similarly shaped male die 35, and at the edge of the male die is a rib 34 forming in connection with the outer edge, of the female die a shearing face by which the sheet of gold or other metal may be out to the exact size necessary for the formation of the crown. Upon the upper face of the die 35 within the cutting rib 34 are two projections 36 of less height than Immediately above these projections are depressions 37 in a female die 24. These elevationsand depressions are the diesproper and between .them the front and rear halves of the tooth crown are formed from the plate of sheet metal cut out from a piece of stock by the rib 34. These two portions of the crown are swaged side by side from the same sheet of metal and when they are to be finished, the front and rear half will be separated from each other by cutting the plate and finishing up the crown in the usual manner.

In use the sheet of gold or other metal is opposite ribs 25 a 1o mation of ridges or cavities which would Within the opening of'the plunger and provice comprislng a base plate having a doveformed in the stem,substantially as specified.

pivot ears extending upward from the frame Q eager a placed over the male die, and the lever 18'is plunger rod, the opposite sides of said plate turned for the purpose of forcing the female engaging the side Walls of the pivot ears to die down, the first action bein to sever from prevent turning of the plunger, a cam lever the sheet a small piece of o d of sufficient arranged to operate on said plate, springs 5 size to term the front and lack. portions of for elevating the plate and rod, the lower end the crown. This small 'iece of gold is then of said rod haw a central opening, and forced down over the tie, and isproperly being provided wit a diametrically extendshaped The surfaces of the dies'are refering recess, a movable cutting and swaging ably made so smooth as toprevent t e fordie having an integral stem arranged to fit serve for the lodgement of particles of food, vided with a pair of ribs arranged to fit with- While the crowns are in place in the mouth. in said diametrically extending recess, and a a I claim e I spring actuated locking pin carried by the A. manually operable crown swaging (leunger and arranged to fit Within anopening tailed groove, a combined cutting and swag- In testimony that I claim the foregoing as ing die disposed therein, a framecarried by my own, I have hereto aflixed my signature the base and provided with a vertical guiding in the presence of'two witnesses. o ening in alinernent with said die, a pair of LAURENCE C GRAHAM and provided with parallel inner walls, a Witnesses: plunger'rod extending through the guiding D. G. MCNAIR, opening, a plate secured to the top of the C. H. JOHNSON. 

